mirror of
https://github.com/brain-hackers/u-boot-brain
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196 lines
4.2 KiB
C
196 lines
4.2 KiB
C
/*
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* U-boot - serial.c Serial driver for BF533
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*
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* Copyright (c) 2005 blackfin.uclinux.org
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*
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* This file is based on
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* bf533_serial.c: Serial driver for BlackFin BF533 DSP internal UART.
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* Copyright (c) 2003 Bas Vermeulen <bas@buyways.nl>,
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* BuyWays B.V. (www.buyways.nl)
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*
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* Based heavily on blkfinserial.c
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* blkfinserial.c: Serial driver for BlackFin DSP internal USRTs.
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* Copyright(c) 2003 Metrowerks <mwaddel@metrowerks.com>
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* Copyright(c) 2001 Tony Z. Kou <tonyko@arcturusnetworks.com>
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* Copyright(c) 2001-2002 Arcturus Networks Inc. <www.arcturusnetworks.com>
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*
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* Based on code from 68328 version serial driver imlpementation which was:
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* Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu>
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* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
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* Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org>
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* Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
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*
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* (C) Copyright 2000-2004
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/irq.h>
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#include <asm/system.h>
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#include <asm/segment.h>
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#include <asm/bitops.h>
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#include <asm/delay.h>
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#include <asm/uaccess.h>
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#include "bf533_serial.h"
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DECLARE_GLOBAL_DATA_PTR;
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unsigned long pll_div_fact;
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void calc_baud(void)
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{
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unsigned char i;
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int temp;
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for(i = 0; i < sizeof(baud_table)/sizeof(int); i++) {
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temp = CONFIG_SCLK_HZ/(baud_table[i]*8);
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if ( temp && 0x1 == 1 ) {
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temp++;
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}
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temp = temp/2;
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hw_baud_table[i].dl_high = (temp >> 8)& 0xFF;
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hw_baud_table[i].dl_low = (temp) & 0xFF;
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}
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}
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void serial_setbrg(void)
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{
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int i;
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calc_baud();
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for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) {
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if (gd->baudrate == baud_table[i])
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break;
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}
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/* Enable UART */
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*pUART_GCTL |= UART_GCTL_UCEN;
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asm("ssync;");
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/* Set DLAB in LCR to Access DLL and DLH */
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ACCESS_LATCH;
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asm("ssync;");
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*pUART_DLL = hw_baud_table[i].dl_low;
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asm("ssync;");
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*pUART_DLH = hw_baud_table[i].dl_high;
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asm("ssync;");
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/* Clear DLAB in LCR to Access THR RBR IER */
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ACCESS_PORT_IER;
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asm("ssync;");
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/* Enable ERBFI and ELSI interrupts
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* to poll SIC_ISR register*/
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*pUART_IER = UART_IER_ELSI | UART_IER_ERBFI | UART_IER_ETBEI;
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asm("ssync;");
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/* Set LCR to Word Lengh 8-bit word select */
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*pUART_LCR = UART_LCR_WLS8;
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asm("ssync;");
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return;
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}
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int serial_init(void)
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{
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serial_setbrg();
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return (0);
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}
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void serial_putc(const char c)
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{
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if ((*pUART_LSR) & UART_LSR_TEMT)
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{
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if (c == '\n')
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serial_putc('\r');
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local_put_char(c);
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}
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while (!((*pUART_LSR) & UART_LSR_TEMT))
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SYNC_ALL;
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return;
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}
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int serial_tstc(void)
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{
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if (*pUART_LSR & UART_LSR_DR)
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return 1;
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else
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return 0;
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}
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int serial_getc(void)
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{
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unsigned short uart_lsr_val, uart_rbr_val;
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unsigned long isr_val;
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int ret;
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/* Poll for RX Interrupt */
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while (!((isr_val = *(volatile unsigned long *)SIC_ISR) & IRQ_UART_RX_BIT));
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asm("csync;");
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uart_lsr_val = *pUART_LSR; /* Clear status bit */
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uart_rbr_val = *pUART_RBR; /* getc() */
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if (isr_val & IRQ_UART_ERROR_BIT) {
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ret = -1;
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}
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else
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{
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ret = uart_rbr_val & 0xff;
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}
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return ret;
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}
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void serial_puts(const char *s)
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{
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while (*s) {
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serial_putc(*s++);
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}
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}
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static void local_put_char(char ch)
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{
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int flags = 0;
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unsigned long isr_val;
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save_and_cli(flags);
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/* Poll for TX Interruput */
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while (!((isr_val = *pSIC_ISR) & IRQ_UART_TX_BIT));
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asm("csync;");
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*pUART_THR = ch; /* putc() */
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if (isr_val & IRQ_UART_ERROR_BIT) {
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printf("?");
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}
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restore_flags(flags);
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return ;
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}
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